Manipulation of the homogeneous linewidth of an individual In(Ga)As quantum dot

R Oulton, J J Finley, A D Ashmore, I S Gregory, D J Mowbray, M S Skolnick, M J Steer, S L Liew, M A Migliorato, A J Cullis

Research output: Contribution to journalArticle (Academic Journal)peer-review


By application of external electric field, we demonstrate the ability to controllably manipulate the homogenous linewidth of exciton transitions in a single self-assembled In(Ga)As quantum dot (QD). Complementary emission (photoluminescence) and absorption (photocurrent) measurements are used to probe directly the competing processes of radiative recombination and carrier tunnelling escape from the dot. At high electric fields (greater than or similar to100 kV/cm) the exciton line shape is lifetime (homogenously) broadened with mesoscopic broadening effects arising from coupling of the QD to its electrostatic environment determining the low field line shape.

Original languageEnglish
Article number045313
Pages (from-to)-
Number of pages4
JournalPhysical Review B: Condensed Matter and Materials Physics
Issue number4
Publication statusPublished - 15 Jul 2002


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